Nozzle of gas hot air gun

ABSTRACT

A nozzle of gas hot air gun comprising a main body, an air blower, an ignition device, a switch set and a nozzle; the main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of the barrel, a blower and the ignition device are inside the barrel, a gas can is inside the handle; several spray holes are installed on the nozzle; users press the switch set and have gas spray out from the spray holes of the nozzle into the mixing chamber to mix with air properly and then is sent to the heating chamber for complete burn.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to a gas hot air gun and, more specifically, to a nozzle of gas hot air gun that offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.

2. Description of the Prior Art

Heretofore, it is known that the “Internal structure of a hot air gun” of Taiwan listed pattern no. 83795 comprises of a shell body 1, a hot air pipe pedestal 2, an insulated ceramic pedestal 3, an air pipe 4 and an air blower 5; the shell body 1 contains all the above components; an electrical heating coil 6 wraps around the hot air pipe pedestal 2 externally, the combination is inserted into the insulated ceramic pedestal 3, the air pipe 4 is installed outmost and fixed internally onto the shell body 1; the electrical heating coil 6 generates high temperature air, the air blower 5 blows the hot air out through the air pipe 4.

In real application, the known hot air guns still have many drawbacks; since they need a power core to plug into the wall power to have the electrical hot wire 6 generate hot air, the length of the electrical hot wire 6 must be long enough to generate the temperature needed, if the electrical hot wire 6 is too long, then the shell body 1 must be large enough to accommodate, such results bulky physical size and not easy for users to carry; if the electrical hot wire 6 is too short, then the temperature is too low to apply; the electrical heating coil 6 remains hot after application, users can not pack the hot air gun up right away; users might get burn carelessly very often, the design of known hot air guns is not very safe, not very practical and needs improvement.

SUMMARY OF THE INVENTION

It is therefore a primary object of the invention to provide a nozzle of gas hot air gun that improves the known hot air guns have to apply AC power to generate heat with an electrical heating coil, and offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.

In order to achieve the objective set forth, a nozzle of gas hot air gun in accordance with the present invention comprises a main body, an air blower, an ignition device, a switch set and a nozzle; the main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of the barrel, a blower and the ignition device are inside the barrel, a gas can is inside the handle; several spray holes are installed on the nozzle; users press the switch set and have gas spray out from the spray holes of the nozzle into the mixing chamber to mix with air properly and then is sent to the heating chamber for complete burn.

BRIEF DESCRIPTION OF THE DRAWINGS

The accomplishment of the above-mentioned object of the present invention will become apparent from the following description and its accompanying drawings which disclose illustrative an embodiment of the present invention, and are as follows:

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an assembly view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is an application view of the present invention;

FIG. 5 is a cross-sectional view of a further embodiment of the present invention;

FIG. 6 is another cross-sectional view of a further embodiment of the present invention;

FIG. 7 is a perspective view of another application of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 to FIG. 3, the present invention comprises a main body 10, an air blower 20, an ignition device 30, a switch set 40 and a nozzle 50; the main body 10 further consists of a barrel 11 and a handle 12, a heating chamber 111 is inside the barrel 11, a gas can 122 is inside the handle 12, the nozzle 50 contains several spray holes 511, the switch set 40 have the fluid of the gas can 122 flow into the nozzle 50 and spray out to the mixing chamber 112 through the spray holes 511; users can press the switch set 40 to have the fluid of the gas can 122 spray out from the nozzle 50, the spray holes 511 of the nozzle 50 spray the fluid into the mixing chamber 112 to be mixed with air before entering the heating chamber 111 to be burnt completely in the heating chamber 111.

The main body 10 comprises of a barrel 11, a handle 12, an intake 13 and a exhalation hole 14; a heating chamber 111 and a mixing chamber 112 are on the inner front of the barrel 11, a daisy shape metal slice 113 and a catalyst 114 are inside the heating chamber 111, the metal slice 113 is installed inside the heating chamber 111 near the front side of the barrel 11, the catalyst 114 is installed near the end of the barrel 11; a burning chamber 115 is inside the metal slice 113, the mixing chamber 112 in installed on the barrel 11 that is opposite to the location of the heating chamber 111; a shrink 116 near the metal slice 113 is formed on one end of the mixing chamber 112, the shrink 116 is interlinked to the burning chamber 115 of the metal slice 113; several air inhalation holes 117 are around the mixing chamber 112, a passages 118 is between the metal slice 113 and the barrel 11; a tube shape metal net 119 to control the mixing air flow is installed between the burning chamber 115 of the metal slice 113 and the shrink 116 of the mixing chamber 112, a thicker metal net 120 with smaller net holes near the exhalation hole 14 is on one side of the metal net 119. The handle 12 is connected to and beneath the barrel 11, a first container 123 and a second container 124 are inside the handle 12, a battery set 121 and a gas can 122 are inside the first and the second container 123, 124 respectively, the gas can 122 contains burnable fluid, usually is liquid gas; a movable cover 125 is on the bottom of the handle 12 to cover the first and the second container 123, 124. The intake 13 is installed on the end of the barrel 11 for air to flow into the barrel 11; several protective grids 131 are on the intake 13 to prevent users from inserting their fingers in. The exhalation hole 14 is on the front of the barrel 11 to expel air from the barrel 11.

The air blower 20 in installed internally on the end of the barrel 11 to draw air from the intake 13 into the barrel 11, a DC motor is applied in this application, the blower 20 further comprises a motor 21, a fan blade 22 and a temperature sensor 23; the motor 21 locates near one side of the exhalation hole 14, the fan blade 22 is installed on the motor 21 and near one side of the intake 13 to be driven by the motor 21; the temperature sensor 23 is installed around the barrel 11 near the heating chamber 111, the temperature sensor 23 controls the motor 20, after end of application and when the temperature of the heating chamber 111 below certain temperature, the temperature sensor 23 stops the motor 21 from turning.

The ignition device 30 is installed inside the metal slice 113 of the heating chamber 111 to ignite the mixed gas in the heating chamber 111; the ignition device 30 is installed inside the burning chamber 115 of the metal slice 113 in this application.

The switch set 40 is installed inside the handle 12 of the main body 10 near the barrel 11; the switch set 40 further comprises of a power switch 41, an ignition switch 42 and a regulation valve 53; the power switch 41 connects to the battery set 121 and the blower 20 with electrical wires, the power switch 41 also has a control rod 411 to open and close the gas can 122; the ignition switch 42 connects between the battery set 121 and the ignition device 30 with electrical wires; the regulation valve 43 is installed on the gas can 122 to control the gas flow amount of the gas can 122.

The nozzle 50 is installed inside the barrel 11 of the main body 10 and located between the blower 20 and the mixing chamber 112; the nozzle 50 is in rectangular shape with several spray holes 51, several fluid paths 52 opposite to the spray holes 51 are on the nozzle 50, the fluid paths 52 are connect to the spray holes 51 inside the nozzle 50, the fluid paths also connect to the gas can 122 to have the contents of the gas can 122 spray into the mixing chamber 112 and mix with fresh air through the spray holes 51; the evenly distributed spray holes 51 on the nozzle 50 spray out gas simultaneously at a larger area into the mixing chamber 112 to mix the gas and air with good ratio to be burnt completely, such scheme can avoid the generation of carbon mono-oxide.

Referring to FIG. 4, when the power switch 41 is pressed on, the control rod 411 opens the gas can 122, the gas sprays out from the spray holes 51 of the nozzle 50, since the spray holes 51 is evenly distributed on the nozzle 50, the gas entering the mixing chamber spreads properly; at the same time, the blower 20 blow air from the intake 13 into the mixing chamber 112 to mix the gas and the air blown in; when the mix gas passes the shrink 116, with the shrinking diameter of the shrink 116, the mixed gas is compressed, the mixed air spays out the shrink 116 at a faster speed, the high speed injected mixed air entering the burning chamber 115 of the metal slice 113 flows to the tube shape metal net 119 that guides the flow direction of the mixed gas (referring to FIG. 5), with the two blocks by the thicker metal net 120 on the front of the tube shape metal net 119 and the tube shape metal net 119 itself, since the net holes of the thicker metal net 120 is smaller, the mixed gas is blocked effectively to have most of the mixed gas spays out in all directions. When the ignition switch 42 is pressed, the ignition device 30 ignites the mixed gas and generates flame, the flame expands several tongues of flames from the burning chamber 115 to surround the metal slice 113 and have the temperature of the metal slice 113 rise gradually that forms the first burning; with the better heat exchange rate of the metal slice 113, when the air flow sent by the blower 20 passes through the passage 118 of the metal slice 113, air flow can bring the heat on the metal slice 113 to generate hot air; when the hot air passes through the catalyst 114, the catalyst 114 burns the small quantity left-over gas to reduce the quantity of carbon mono-oxide (CO) that forms the second burning; after two times of burning, the air temperature is higher, the air is safer, the catalyst 114 avoids the burning flame in the metal slice 113 from coming out of the nozzle 14.

The mixed gas needs to have a good ratio of fresh air and gas to be properly burnt, when oxygen contained is too low in the mixed gas, the inhalation holes 117 around the burning chamber 115 offers fresh air; the diameter of the shrink 116 of the mixing chamber shrinks 112 gradually, fresh air is sucked in, mixed with gas and enters the burning chamber 115 to be burnt stably; the quantity of gas can also be controlled by the regulation valve 53; since the metal slice 113 inside the heating chamber 111 has very good heat conductivity, the temperature of the metal slice 113 is lifted rapidly after the ignition inside the burning chamber 115; if the gas in the heating chamber 111 is not burnt properly, the toxic carbon mono-oxide is generated and is harmful to human body; in order to achieve complete burning, the catalyst 114 can achieve such purpose, the catalyst 114 reacts with the burning gas and generates non-toxic carbon di-oxide, the catalyst 114 can also prevent the flame from coming out of the exhalation hole 14.

The motor 21 is installed near the front of the barrel 111, the fan blade 22 is installed near the end of the barrel 11, such arrangement makes the air blown by the blower 20 smoother, the gas from the nozzle 50 is easier to be lighted by the ignition device 30 not to be scattered by strong wind. The temperature sensor 23 connecting to the blower 20 is installed on the barrel 11 near the heating chamber 111; when power switch 41 is turned off, the nozzle 50 stops spraying, the heating chamber 111 stops burning process but still remains in high temperature condition, the temperature sensor 23 detects high temperature and have the blower 20 keep turning, the blower 20 can still turn and send fresh air to lower the heating chamber 111 temperature, the metal slice 113 has good heat conductivity to lower the heating chamber 111 temperature with cool air; when the temperature sensor 23 detects the heating chamber 111 reaches certain cool temperature, the blower 20 is stopped, the design makes the present invention easier to carry and prevent users from danger of burn.

Referring to FIG. 6, another application example of the present invention, the nozzle 60 is in round shape with several spray holes 61, the periphery and empty area inside of the nozzle 60 offers air flow path to mix the gas sprayed by the spray holes 61. Referring to FIG. 7, the nozzle 70 is in cross shape with several spray holes 71, the periphery of the nozzle 70 offers air flow path to mix the gas sprayed by the spray holes 71. The nozzle 50 with multiple spray holes design offers mixed gas with proper gas-air ratio for higher temperature hot air; the scheme makes the main body 10 smaller in physical size for smaller storage space and is easier for users to carry.

While a preferred embodiment of the invention has been shown and described in detail, it will be readily understood and appreciated that numerous omissions, changes and additions may be made without departing from the spirit and scope of the invention. 

1. A nozzle of gas hot air gun comprising: a gas can; a nozzle with several spray holes, a fluid path is on said nozzle to connect to said spray holes inside said nozzle, one end of said fluid path connects to said gas can to have the contents of said gas can spray out through said spray holes.
 2. A nozzle of gas hot air gun comprising: a main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of said barrel, a battery set and a gas can are inside said handle, gas can contains burnable fluid; an air blower in installed internally on the end of said barrel and is powered by the battery set; an ignition device is installed inside said barrel; a switch set is installed inside said main body; a nozzle with several spray holes is installed inside said main body, a fluid path is also installed on said nozzle, one end of said fluid path connects to said gas can to have the contents of said gas can spray out through said spray holes, users press said switch set and have gas spray out from said spray holes of said nozzle into said mixing chamber to mix with air and then is sent to said heating chamber for complete burn.
 3. The nozzle of gas hot air gun according to claim 2, wherein said nozzle is installed inside said barrel of said main body.
 4. The nozzle of gas hot air gun according to claim 3, wherein said nozzle is installed between said blower and said mixing chamber.
 5. The nozzle of gas hot air gun according to claim 4, wherein said spray holes of said nozzle are installed toward said mixing chamber.
 6. The nozzle of gas hot air gun according to claim 1, wherein said nozzle is in round shape.
 7. The nozzle of gas hot air gun according to claim 1, wherein said nozzle is in cross shape.
 8. The nozzle of gas hot air gun according to claim 1, wherein said nozzle is in rectangular shape.
 9. The nozzle of gas hot air gun according to claim 2, wherein said nozzle is in round shape.
 10. The nozzle of gas hot air gun according to claim 2, wherein said nozzle is in cross shape.
 11. The nozzle of gas hot air gun according to claim 2, wherein said nozzle is in rectangular shape. 